Liberty City map?

KD himan

Hello guys, i just want to know that where is the Liberty city interior or place? i saw ProDX34 making mission there. i cant found that map on SA, so any idea about where it would be? it was once used in a GTA SA mission where we have fly to liberty city to kill some people then come back. waiting for any answer. and please do not say it doesnt exist because it is. ProDX34 is not much active user, i already PM'ed him other things but he didnt replied. so i hope you guys can.